A firm evaluates the following projects, when interest rates are $12\%$ for every maturity:

Year A B C

$0-200-150-50$

$115012540$

$215012530$

If the projects are mutually exclusive, which project$($s$)$ should the firm approve?

a$.$

Project A and Project C

b$.$

Project C

c$.$

Project B and Project C

d$.$

Projects A$,$ B and C

e$.$

Project A and Project B

f$.$

Project B

g$.$

Project A